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/*
* EffecTV - Realtime Digital Video Effector
* Copyright (C) 2001-2006 FUKUCHI Kentaro
*
* LifeTV - Play John Horton Conway's `Life' game with video input.
* Copyright (C) 2001-2002 FUKUCHI Kentaro
*
* This idea is stolen from Nobuyuki Matsushita's installation program of
* ``HoloWall''. (See http://www.csl.sony.co.jp/person/matsu/index.html)
*/
#include <stdlib.h>
#include <string.h>
#include "EffecTV.h"
#include "utils.h"
static int start(void);
static int stop(void);
static int draw(RGB32 *src, RGB32 *dest);
static int event(SDL_Event *event);
static char *effectname = "LifeTV";
static int stat;
static unsigned char *field, *field1, *field2;
static void clear_field(void)
{
memset(field1, 0, video_area);
}
effect *lifeRegister(void)
{
effect *entry;
sharedbuffer_reset();
field = (unsigned char *)sharedbuffer_alloc(video_area*2);
if(field == NULL) {
return NULL;
}
entry = (effect *)malloc(sizeof(effect));
if(entry == NULL) {
return NULL;
}
entry->name = effectname;
entry->start = start;
entry->stop = stop;
entry->draw = draw;
entry->event = event;
return entry;
}
static int start(void)
{
image_set_threshold_y(40);
field1 = field;
field2 = field + video_area;
clear_field();
stat = 1;
return 0;
}
static int stop(void)
{
stat = 0;
return 0;
}
static int draw(RGB32 *src, RGB32 *dest)
{
int x, y;
unsigned char *p, *q, v;
unsigned char sum, sum1, sum2, sum3;
int width;
RGB32 pix;
width = video_width;
p = image_diff_filter(image_bgsubtract_update_y(src));
for(x=0; x<video_area; x++) {
field1[x] |= p[x];
}
p = field1 + 1;
q = field2 + width + 1;
dest += width + 1;
src += width + 1;
/* each value of cell is 0 or 0xff. 0xff can be treated as -1, so
* following equations treat each value as negative number. */
for(y=1; y<video_height-1; y++) {
sum1 = 0;
sum2 = p[0] + p[width] + p[width*2];
for(x=1; x<width-1; x++) {
sum3 = p[1] + p[width+1] + p[width*2+1];
sum = sum1 + sum2 + sum3;
v = 0 - ((sum==0xfd)|((p[width]!=0)&(sum==0xfc)));
*q++ = v;
pix = (signed char)v;
// pix = pix >> 8;
*dest++ = pix | *src++;
sum1 = sum2;
sum2 = sum3;
p++;
}
p += 2;
q += 2;
src += 2;
dest += 2;
}
p = field1;
field1 = field2;
field2 = p;
return 0;
}
static int event(SDL_Event *event)
{
if(event->type == SDL_KEYDOWN) {
switch(event->key.keysym.sym) {
case SDLK_SPACE:
clear_field();
break;
default:
break;
}
}
return 0;
}
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